Really fun game with smooth controls! I had a lot of fun blasting the enemies and dodging them. I have two improvements that you could make tho - one is that for the weapon upgrades, you could increase the number of bullets you shoot per shot as you get more upgrades to make it more visually satisfying. I'm assuming right now it just upgrades damage, which doesn't really seem to do much because I one-hit all the enemies anyways. The second is add a sound indicator, like a beep, for when you get full energy so that you don't have to constantly look down at the bar. Overall, great job!