Thanks for playing and for your feedback!
I haven't played many metroidvanias, only a few (Axiom Verge, Hollow Knight, ...etc, currently Bloodstained) but I love the genre among other things for the discovery and mistery part, so it's good to know I nailed it in that regard more or less.
The bat form is a broken OP I know. Originally it didn't even have a time-limit so I added one because it was way too game-breaking. :D
Making sure the player can't go outbunds - only in case I hide an easter egg or something would fix it to a degree...and probably boss arenas with similar failsafe design.