You could consider eliminating some upgrades. For instance, "Bounce" is useless unless you upgrade the % and the radius. Both go up so incrementally that its never useful. Maybe just have Bounce have limitless radius? And so on for others...
I am actually eliminating upgrades right at this moment. Missilespeed has already been replaced with "Impetus". You can send me a list of upgrades you currently think are useless/bad and I am going to change them into something more interesting. ;)
Critical and Block training can be idled. Left Critical training (on Turbo) on over night and gained 70 levels, 350 clovers. Stats maxed, and beat the final boss with no trouble. Very fun game!
I am actually eliminating upgrades right at this moment. Missilespeed has already been replaced with "Impetus". You can send me a list of upgrades you currently think are useless/bad and I am going to change them into something more interesting. ;)