It appears to be impossible to unequip hats--this is a big problem, given that wearing the Viking helmet causes you to lose at the first avalanche during risk training on the glacier.
Occasionally in the 3rd flying minigame I will land just on the edge of the target, resulting in me having a negative score. I feel like this is probably a glitch, seeing as I think it makes far more sense to have either a positive score for hitting the target or a MISS for missing it.
Completed the game, pushed the restart button to try to dodge the bear instead of shooting it, and couldn't interact with anything (aside from pushing things around, including the bear) as I walked
I can't scroll on the achievements window, either by clicking and dragging or by trying to scroll using my touchpad. (Which seems odd because the Unlocks page *does* scroll...)
My "Buy an item" achievement randomly disappeared, re-locking the inventory until I went and bought something. This should probably be fixed (if possible, by granting this achievement to players who have items in the inventory and/or equipped.)
There seems to be some sort of weird error where destroying the blue-and-yellow cube planet gives the 1D planet achievement, (what I assume is) the 1D planet is named Invisiplanet and gives the Rubik's planet achievment, the Star Wars Death Star is named Pandoras and gives that achievement, and the planet with the three rings is named Deathstar and gives the Death Star achievement. If there are more swaps like this I haven't found them.
 "DuckLife 4"){kind=icon}
 "The Title is Intentionally Left Blank"){kind=icon}
 "I am ME"){kind=icon}
 "AdVenture Capitalist"){kind=icon}
 "Idle Necromancer"){kind=icon}
 "World Eater Idle"){kind=icon}