You're completely right! Thanks for the very insightful post, it helps to know about the possibilities of communicating information to the player. I think you're right too, that maybe I don't need to ADD a mechanic (aside from maybe a checkpoint system of sorts?), but rather just improve the level design to properly convey things to the player. :) I'll definitely change the level up in prep for the full release, thank you. :)
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You would definitely have to test it out! A checkpoint system could be nice for sure, but I think with proper design and balance of the mechanics, the fun of trying a level again and again and mastering the jumps of the levels is super driving if executed correctly. I could also see it working super well with some kind of timer, allowing people to speedrun and compare times, where the checkpoint system would be a great way to practise the tougher sections, whilst also allowing casual players a better experience.
Glad I could be of help, good luck with the full release :D