Very good use of art and assets! Felt smooth to play and had an interesting concept. I really liked the swapping mechanic and how you used it as not only a tool for transportation but also fighting.
The only two criticisms I can think of are that the jump feels a little odd, almost like you're floating back down and can't air strafe, however the level design made it so it wasn't a big problem, just didn't feel satisfying to jump around much.
And the other is regarding the teleporting to the sigils or teleport markers (forgot the name, apologies!). This is potentially a skill issue on my end, but it was rather difficult to teleport across the spike pit because of the very quick reaction time and precision needed, potentially increasing the hitbox for those markers could make this a tad more forgiving.
Otherwise well done! I finished the game but don't think I found all of the red orbs ;D