Another thing I noticed that I found annoying is that you can eat Mold cakes during invincibility frames, which feels super cheap when they just happen to hover over your respawn position after you die and you have no chance to dodge them.
Additionally, eating Antimatter cakes (even if you don't actually lose weight) or gaining weight during respawn invincibility will cut your invincibility short (because it replaces it with the shorter invincibility from weight gain/loss), which can lead to some cheap-feeling chain-deaths if you accidentally eat an antimatter cake after respawning.