Yeah, expect criticism from the Internet by using Slender. Apparently he's now "owned" by the original devs that worked on the Slender game that went viral. *rollseyes*. (He isn't, but the Internet will make you think he is).
As far as I'm concerned, You'd probably get criticized no matter what. Though heck, maybe this will get your game more attention for it. Also, Land sharks? *shudder*. That's just...terrifying.