I feel that it starts kinda slow, and then gets a bit too hard too quickly. Just holding to fire woud've probably felt a bit more fun.
The arena scale idea is interesting!
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Thank you very much!!! It was originally planned to hold to fire, but when I added 10 more waves, numbers seemed to get out of hand and holding to fire was crashing the game, In retrospective, as someone else mentioned in their comment, upgrading attack speed by (not) a fixed amount would have fixed it, but what I came up with was to make it click to shoot. Added the triple shot upgrade in exchange though!!