Last year I shared a prototype for my game Anastomosis. I'm  quite happy with it and I got nice feedback, so I felt encouraged to make a full version of the game. This version has:

• 25 levels
• A more intuitive UI
• Progress saved to your browser
• Abilities are gradually unlocked
• Reverts
• Made my own graphics
• Characters to talk with
• Jetpacks

The game now takes a few hours to complete. I've added optional challenges such as a delivery side-quest, a scissor-paper-rock mini-game, and trophies in difficult (but visible) places. You could also try to solve the game in the fewest number of snapshots, merges, and reverts. 

I don't intend on making another major update for this game. If I ever make a game with this mechanic it would probably be an RPG. I hope that this game inspires someone else to make a game that uses these mechanics. If you're making a game like this, feel free to reach out and discuss it with me,