2D in 3D? 3D in 2D? or maybe even 2.5D game? I don't know how to call it but thanks for how "New Start OID Way" was made it is surely one of more unique games I have seen.
Gameplay is simple but works. You have one player and the second player. The first sees the entire level with spikes and the flag while the second sees only the path he took and the flag. The first part is just a simple maze, go from A to B. The second part is more interesting because spikes this time are replaced with nothing, pits. It makes going fast through the levels more viable than tying to remember the path. Later levels don't have this problem but even then can be beaten by brute-forcing through them.
Music is very repetive and can become boring fast and with the fact that there is almost no other sounds this game can be played muted. But you had solid idea and you made a good game but it needs more playtesting