I thinks you did really well with the theme. Also I really like all of the visuals I think they are very unique and make the game a cohesive whole.
While I like the concept of the game mechanic I don't think it gels well with the kind of "precision platformer" thing the game is. Its kind of overwhelming having to think about switching the mask while also dodging the spears and positioning correctly for the spikes. I think the mask mechanic would work much better for a slower more methodical puzzle game.
Also on the level where you get to choose either the spears path or the spikes path I could not for the life of me align myself so that I could get past the spikes.
All in all I did enjoy my time with the game and especially for a second jam I think you did an amazing job. Keep up the good work!