Well, take your time to add save system. For the spikes part, fix adding a death animation or putting a health system.
And for the restart button, if it is by the resolution, adjust the UI resolution so that they were homogeneous at all levels.
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Why would I add a save system, litterally no one else is complaining about it, also why would I "fix" my death animation I mean sure its a bit annoying you get to keep moving but other than that its mostly a visual bug, also the pause and reset buttons do work, its just that for some reason in the later levels they arent there and I cant edit the game anymore now