Number of items (XP, HP, etc) now depends on the point in the stage, not the rank of the individual enemy. Adjusted XP ->level curve accordingly.
Fixed typo in main menu typo (duh!).
Item drops are now rolled individually instead of in bulk for each enemy, which should lead to more consistent drop counts.
Added a refund button for upgrades.
Spinning star enemy does less damage for ranks 2 and higher.
Added an option to enable or disable VSync.
Guide "wisp" spawns a little closer to the player so it's easier to see vertically.
Demo v0.19 Patch Notes
Source: Steam Community (opens in a new tab)