Ah man, it makes me so happy to hear that people are still playing this game :)
Let me dig through some of my notes from back then...
OK, so there are 13 bonus levels in total (level 100-112) because 13 is my favorite number. Those are unlocked from the rainbow cubes. If you can reach level 112, you got all the cubes. I don't think I hid any of them in any particularly sneaky way.
As far as platinum medals. According to my notes there are 15 of them in total. Mostly, I added them when there was a way to "break" the intended path and skip part of the level for a super fast time. There is a very subtle tell if a level has a platinum medal, so we'll start with that if you don't want spoilers. The exit gate on the level will be grayscale instead of rainbow colored.
If you wanted all the levels with a platinum medal, here you go. Unfortunately, I don't have the goal times saved anywhere. Would have to dust off the Unity project and dig into the code ha.
| 4 | Parkour |
| 8 | Totem |
| 11 | Incorporeal |
| 17 | Ascent |
| 22 | Chromatic Tunneling |
| 23 | Color Slide |
| 26 | Pitfall |
| 42 | Aurora Borealis |
| 52 | Locks and Lasers |
| 63 | Firing Squad |
| 68 | Parabola |
| 74 | The Sniper |
| 81 | Piston |
| 96 | Don't Look Down |
| 98 | Ignition |
Also, thank you for playing my game and reaching out. Really makes me happy to hear that I made something that resonated with someone else :)
-ben