I player through the 20 waves and I had a lot of fun with the game! At first it started out slow, but by wave 20 I felt like a panicked, squealing juggernaut. I like the upgrades and how they actually show up during the arena stage, while also allowing you to feel the effects. One thing would like though would be to have a little bit more of an active role. I get the whole point of the concept is for you to just run around and leave the letters behind you, but after a while, if you hadn't given me the feel of powerful upgrades, it would have gotten a bit boring. Another thing is that it kinda got grindy at times. Some of the enemies were really slow and couldn't get hit by the letters before they dissappeared (echo + vibratio god tier combo). So yeah! I hope you can still develop onto the game and can't wait to play more of your stuff!