Potential, but has problems...
The key combos are very touchy. It's too easy to lose dash mode and thus make rewinding impossible.
Also, you need to explore for exits, but some spots have the same charming design error as my old school; After hours, it was possible to leave a building via one-way (panic) doors, then be in a connecting corridor with only one-way doors leading into it, leaving you trapped 'till morning (or in this case, 'till save delete.)
As you design, you probably need to think about 'what if' people do not follow the 'ideal' path, and wind up in areas before they have the key items or skills you expect. Then make sure there is a ^path back to the starting room.