I have been working on a 5-year anniversary update for Dr. Atominus. It's coming a bit late, but here is a sneak peak to the update and also some other important info.
A lot of polishing and quality of life updates
The update will include many small improvements to the game, like improved knockback, hard difficulty and remastered sound. There are also performance improvements and bug fixes.
Along with the update, native Linux support will be coming to Steam. It already works well with proton, but native support has some advantages, like faster startup and easier to navigate game files.
Saving system change and backwards compatibility
Recently Dr. Atominus became available for Playstation 4. A new efficient save system was added for this and it will be on the PC version too. Because of this, old save files will not be compatible with the updated game. That is why I'm telling about the update in advance, so in case you are just playing through the game, you might want to disable updates temporarily. The update will probably be coming either next week or the week after that.
I will tell more details about the update when it comes.
Edit: The update will be coming August 11.