Thanks for playing Soul Grinder! Appreciate the feedback and the kind words. Glad you found the zoom feature useful, this the first piece of feedback we've gotten on that feature so thanks for that. Yes the controls aren't taught to the players very well right now :( We are working on improving that, its our top priority right now.
As for the ending, initially we had plans for a system where each ending would unlock new characters. They all have different abilities so this would unlock new playstyles with each ending you got, adding a lot of strategy and replay value. But for the jam we ended up unlocking all the characters and letting the players enjoy them all right away. Future versions of the game will definitely bring more weight to the different endings and add meaningful strategic choices for each one. :)