Ok first of all.
Why are you not mentioning Crystal Quest?
This is a clone of that game. And you gave NO credit here. Not even a mention. Shameful.
The interface was so bad. You have to click to scroll down in the upgrade descriptions.. in a TINY bar and it drags down so fast you can't even read it.
You have to wait for mouse button to RELEASE before your projectiles fire. This feels completely wrong. If you tested that, you'd have realized that.
No sound.
What's sad is crystal quest was from like 20 years ago and it was immensely better in every possible way.