Your level up system is amazing. I spent almost two hours trying to unlock everything and the slow progression kept me engaged. It felt a bit grindy at times, but never so much that i quit playing. I whish there was a bit more to the combat in the game. I was pretty much just pointing at the enemy and holding down the fire button until they died and I got my xp.  It would have been cool to se some progression based on how well I was doing in each run, maybe increase xp drops after killing X number of enemies or add a final boss. Also, something about the background and the camera make me a bitt dizzy whenever I turn around and move backwards, not sure exactly what happens.  Your thumbnail on the itch page is amazing, really made me looking forward to playing it.