I think this has a lot of potential. It's fun, it could do with some balancing and I think teleport needs to be reworked (probably gives you two and just teleports you to the next portal, using it. The way it is now is super chaotic and hard to play with any intentionality.) Also I think the snake should be slower, because this is more puzzly arcade and I think it would fit better. But amazing job, really good for a first submission.
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Yes, looking back, making the snake slower would probably be a good idea. I also agree that the portals could use a bit of of an rework to be a more strategic block (maybe i could make different coloured portals that teleport only to the same colour? That way it you could differentiate between them more easily).
Anyway, thank you for your support!