Found a crash: It seems to revolve around Lost Grimoire. My deck had run out (besides the two Tickle cards I had) and playing Lost Grimoire wasn't able to draw the three cards it otherwise would have. Either the game didn't know how to draw three cards when I didn't have that many, or Lost Grimoire and Tickle's re-shuffling mechanic interact weird.
Also, Lust Crest appears to not cost the listed price of 50, since I can't buy it when having 75.