WOW! Just, WOW! I have always liked these roguelite arcade style games, and I must say, this was amazing. The music, sound effects, art style, post-processing, it's all really good. Very pleasing overall look to the game. It's super fun as well, I like getting all these different upgrades every round, and 3 bouncy axes really made it hectic and fun. I also like your interpretation of "On the edge", very unique and definitely adds to the game. The boss at the end was also really cool and well made, a little too easy, but cool nonetheless, had my heart pumping after beating level 4, the hardest one imo. The only major balance issue is the spikes, it feels a little too fast and there is almost no time to react to them, and the only technical issue (which is not your fault) is that the game lags after every scene change. Overall an amazing game! I would actually like to see this as a fully-fledged mobile game, this has a really mobile game feel to it. Keep it up!