V1.31-V1.32
Tweaked some sounds and added version on title screen.
V1.32-V1.34
Map changes and graphic changes to thin platforms.
V1.34-V1.35
Changes to X-Ray gun.
V1.355
Added cloud save for high scores.
V1.36
Adjustments to node prices and a few improvements.
V1.37
Minor map changes.
V1.4
Last minute improvements for release.
Added critical hits at 5%.
Change log
Source: Steam Community (opens in a new tab)