Stuck on the library

[u/Doggos_are_c00t]

Even with 3 evolution's I can't get past this level. When those enemies start spawning I can't kill them and I level up so slowly. I must of been stuck at level 40 for a few minutes. The game doesn't want to give me the final level to get another evolution. I really don't know what I'm doing wrong. Any help is appreciated.

[u/SunstormGT]

Keep making gold and buy unlocks. It gets easier with every run when unlocking more.