Wow yeah this is definitely tough! Quite an interesting mechanic for sure, I quite enjoyed trying to solve the puzzles (and also got super frustrated at how bad I was at at haha, but thats just my mouse skills). Overall I did quite enjoy the gameplay! Also glad you went with the readable colours, I saw your discussion in discord and its great you're supporting colorblind users :)
Had a few small bits of feedback regarding some minor issues I encountered:
- The blocks that go 'transparent' on and off aren't very readable as to what state they are in, I think maybe some added visual effect / visualisation is needed to really let the player know whether its walkable or not.
- I think the difficulty curve should ramp up a bit slower and consistently - I think I had more issues with the second turn in level 2 than I did with many of the later levels
- I don't think the hazards (like moving blocks etc) reset when the player dies and restarts, meaning the timings will potentially different every time you die so the puzzle won't have the same consistent solution necessarily
- Seems like (at least on the web version) you can drag the red box off the 'playable area' where the blue box can't get it, which lets you kinda cheat and then move your mouse around outside of the game to the point where you want to 'teleport' your red box to