I mean the collidable platforms. You can see them in the screen shots. For example the screenshot with "27" on top has a black horizontal platform in the middle. Looks odd to me eyes, like you accidentally just didn't render there.
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This is great. Plays well, and looks good. My only suggestions would be to have some kind tile art for the walls, as is they're just black and my first reaction was that it was some kind of drawing glitch:)
This is such a neat jam, I wish I've heard of it earlier.
While I haven't participated I'd like to say thank you for reminding me of the Amstrad CPC days, and I'd like to share that Wide-Dot jam directly inspired a "wide pixel mode" addition in the new release of my little retro game framework FES (scroll down a bit for wide mode):