Still ended up experiencing the issue, but I think I got through most of the content that was there (up to level 6, right?).
Anyway, I like the idea of phasing, especially the idea of jumping inside of the blocks. There's some potential to do some interesting things with that. The physics appear to work well, though the character is a touch slow (not necessarily bad, but that may bother some). Level 5 seems to be a bit of a difficulty spike though, and it looks like may you need to modify the hitboxes on those spikes (I died by touching the empty top corners of the spike).
I think its a great idea, particularly with the phasing. It'll be interesting to see how creative you get with it. 
Yes there are still 6 implemented levels, I'm making sure the engine is completely stable as most things I am editing inside the scene so would have to redo all of them if I were to make a major change. I have now fixed the hitboxes of the spikes. The whole point behind this idea was that concept, however I have had to resort to actually only using the phase blocks for show as it was too hard to implement otherwise. This lead to me using invisible reizeable sensors which has been quite annoying with glitches.
To be honest, I thought the character was actually slightly too fast, but as you said that, I definitely won't change anything now; it's all a matter of opinion.
Could you post your browser specs as since I updated I haven't been able to come across that glitch, and could you check whether it is still glitchy.
The phaising is one of the two mechanics I am planning to implement, the hardestto implement by far though; the other is wrapping screen to access certain areas especiall on a scrolling level.
Also, level 5 is just a test on how difficult while not making the player rage, I can get on a 1 screen level.
I really dislike spikes with hitboxes beyond the graphics, please address that first.
#2 - noticeable on level 5, you can jump to the left of the phase box and float there. I don't think this was your intention for the phasing mechanism.
#3 - after you complete level 6 and go to level select, it darkens whatever level you go to (brightness/tint/hue/png/masking?). Unable to reproduce.
#4 - Level select button doesn't work, I suggest you take that off for now and have a "you completed the demo" scene sort of like in Rise n Slime.
First, I fixed the hitbox for the spikes.
#2 Fixed that, was due to the invisible sensors.
#3 Not sure what that is
#4 I'm not really going to bother actually making that as this is pre that and I don't plan on making it stop like in rise and slime, just for now, when it does that you know it has ended, just for now. I'll just make it so when I finish the levels it ends, sorry.
