Hello dunkelgrau! Thanks you for tryin the demo and commenting. The setting is weird indeed. The original idea was to fight a Demonology book who summoned minions on the way. The cactus wizard was just an old idea sleeping in my sketches. I thought it could make for a fun character in an '80s style cute 'em up, using different configurations of spines as bullets.
I agree it's not super clear how to start the game, sorry it wasted your time. I'm still working on this prototype and I hope to turn into a short full game.