There are a few bugs in this game, including enemies jumping into pits, magic gem manipulation, item duplication and being out of bounds.

Item Duplication We can duplicate items in hidden chests if they are picked up before the ¤tick¤ pick up sound and the item pop up in the upper right corner of the screen. This can be done with the Backscratcher, as for some reason it picks up all items in hidden chests, or jumping over the chest and picking it up manually. This second method is a little more difficult, but saving before hand, and some practice, it would be fairly easy.

Magic Gem Manipulation or Gem Duplication This glitch, abuses how the game registers the use of gems. When channeling magic that involves multiple gems, it is possible to interrupt the next gem in line, by picking up another gem. This picked up gem, will have the same properties as the gem initially next in line, but will return back to that colour when dropped. This isn't a viable speed strat, but it is useful to cast Healing with only 2 blue gems. It's fairly tricky to get the the timing down, so practice is required.

Strange Enemy Movements Many enemies have some sort of jump or lunging attack. It is possible to stand near a pit and have them jump to their doom. You won't gain any gems from them, but it's sure safer to have them fall off then to potentially take damage. Sometimes, when you attack and enemy into a protruding (sticking out) corner, it might clip through and fall out of bounds. As for why, no clue. My guess is that some corners overlap and the game is trying to push them back in bounds but they end up being pushed into the second wall instead.

Miasma Out of Bounds It's fairly common for people to stand on top of Zephran Dungeon, Area 1 - Miasma, unintended out of bounds (OoB). But one thing that's confusing is how the map is laid out. If you wear Speed Boots and Winged Boots, jump off the stage and continue dashing in the general outward direction, you'll notice that the minimap loops itself. It is possible that we're too low to see anything, but why would the map loop on itself?