I hate grinding
You scaled the levels up WAY too fast.
I had to go back to level 1 to grind up and since you only have pretty much one lightning per level you have to save it for the right moment when your about to get fucked. I barely beat the last level. And most of the upgrades are useless unless there level 5. Lightning is unuseable till level 5 and upgrading fire rate is a waste of money because the game lags from the background animations anyway so you shoot the same speed. The only level where there was no lag was the Starry Night section. Did you even test play this game? Like halfway through Nibus Basin the difficulty spikes WAY the fuck up and then you have to grind. It has potential for a fun, cute game but as is, its mediocre at best.