Ah, good feedback list so far! Much appreciated, more of that is always useful.
I'll see if I cant give a few responses here...
-Getting hit for no damage: Are you sure you hadnt already taken damage like, a moment before? There is a period of brief invincibility after you do get hit. However, if you hadnt been hit, and then very definitely were struck by something, that might indeed be a bug.
-Room size: Going to be increasing in a general sense. Chris has had pretty much the same thoughts, that some of the rooms are a bit too small. In addition smaller rooms limits what can be done with the bullet patterns, I mean, they can only get so interesting in a 2-block-wide hallway... so expect some changes here.
-Just hit escape and go into the settings to find all of the keybindings and learn to fire your missiles. I use a controller myself so I have no idea what key it is either, but they keybindings are all in there.
-Some enemies are kinda meant to be rather harmless, yeah. Right now what you're seeing is basically every enemy in the game appearing at any time. The weaker ones are the sorts that will be appearing on the first floor or two, which means they need to not be too dangerous at all. So some of them are basically the Goombas of the game. They CAN damage you, but.... it's embarrassing if they manage this. That sort of thing. I can promise though that there will be enemies that are meant to basically eat your face, and eat your face they shall. Well, I'm not going to go totally overboard with them, but still, there'll be at least some of the face eating by them. Of course, the game also has difficulty levels, so later on, you can just pick a higher one and things will get tougher. Right now only bosses are affected by this, somewhat.
-Ship's hitbox may be made smaller soon. Undecided yet.
-Powerups that intentionally screwed you over are "mystery circuits". Think of them like Isaac's pills, or the potions used in many roguelikes. Some good, some bad. What's SUPPOSED to happen is that some of them are supposed to appear with a ? symbol on them and no description, so you dont know what they are till you use them, but that appears to be glitched right now.
-Battleswarm, that boss, not meant to be too tough. There's a reason he gives you all that time to examine where the purple bolts are about to go, heh.
-Bosses not moving: This is because of the nature of the way the game's bullet engine works, plus the nature of my style of pattern design. Anything that moves in the game is controlled not directly but by pre-determined AIs. This is fine for normal enemies (mostly) but for bosses, it doesnt really work out. When the AI is allowed control of a boss's movements, it can place the boss into positions that can create literally undodgeable attacks and such; this is a huge no-no and is to be avoided no matter what. The sorts of patterns the bosses use take, for the most part, alot of precision and are very carefully setup; they work only if the boss's movement (or lack thereof) is predictable. My style of design is influenced by games made by Cave also.... and if you've ever seen their games (like Mushihime-sama or Dodonpachi), the bosses in those games also barely ever move. They might sorta wobble in place a bit or something, but they dont do all that much else. It's actually a very common trait of boss fights in this sort of thing. Other bosses in the game here should prove to be a bit more interesting though... right now I'd be interested to hear what you think about Mirror or Labyrinth in particular, as the bosses go, once you've fought them. Labyrinth is the most recently added and the first "non-standard" boss (AKA, it's a strange fight), and Mirror recently got changed to remove an exploit and increase the difficulty, and being that this is me doing this, I may have gone a tad overboard with the difficulty of the thing. I dont think Mirror is active in this state right now in the version you're playing though, pretty sure that bit hasnt arrived for you yet. Er... I think. Cant keep up with all these version numbers but I submitted the change recently. Battleswarm though, and also Crystal Mother, are meant to not be too tough at all.
-Why are you a spaceship? Well.... ah, just ignore that for now. There's a thing I could explain here but I dont know if I should or not, so I'm not going to, but there's something being worked on related to this that'll come soon and make some changes to cause things to make more sense.
-Hit F7 to see where your hitbox is exactly..... and the hitbox of absolutely every other conceivable thing.
That's all for now!