I didn't use the button to skip upgrades! I wasn't able to defeat the red guy from the third attempt:(
It was fun! The emchanic is really good - upgrades and platformer with 360 are really work well.
The only problems I had with balance:
-Default stats are very low. You even require several upgrades to get to the first platform.:(
- A little strange max lvl difference between lvls : Shooting interval upgrades very slowly and on the max lvl it is still very big
- No projectile speed upgrade!
But it is just balance, I think, it could be easily fixed:) Overal the game is great and I had a good time playing it!