It's very easy to get stuck on non-enemy sprites

[potatolain]

Sprites such as NPCs and doors have weird collisions with players - they work, but you can get stuck on the player, such that you have to move backwards to continue movement, rather than going left and right.

[potatolain]

This came up in Depths on a much bigger scale, where the player actually got completely stuck between two sprites, which was rather challenging to recover from.

This really needs a fix, though it looks like rewriting sprite (or all) collisions might be required.

[potatolain]

Finally fixed in 2.0