Damn, this game has just so much potential! You definetly should've focused more on level design and just completely cut off (for example) the fireballs. Fireballs aren't a bad mechanic, I just feel like they took too much valuable time from you
I quickly discovered, that you can infinitely tower up using 2 arrow keys and I was kind of disappointed that the game never actually used it. (You can't even break the game that way, as the levels are very closed)
I got stuck at the downwards fireball cannon segment for a while, and after I've finally managed to beat it, the game just ended.
I'm not saying the current thing is bad, it just could've been so much better!
I had a good time with this game, but I really hope there was more into it :(