The death rule is excellent on paper. "You die if you are NOT touching the opposite colour" inverts everyone's instinct: normally you run from danger, here you have to keep grazing it constantly. That's permanent tension from a single rule, and it's one of the most original ideas I've read in this whole jam.
And the multiplier going UP when you die is the most generous reading of the theme I've come across. Instead of punishing failure, every failed attempt becomes fuel for the next run. That's practically the definition of a high score chaser, and it's a kinder design than most of the genre manages.
The title screen has real personality too, neon pink with a grid texture, the logo hand written slightly crooked with a little smiling face for the dot. Simple and memorable. And your description explains the death condition three different ways, including an example, which tells me you knew the rule was counter-intuitive and took the trouble to repeat it. Good instinct.
Here's my problem: I could not start it. The screen says PRESS [ENTER] and Enter did nothing at all. I clicked the canvas first (the yellow focus border did appear), pressed it repeatedly, tried the numpad Enter, and even dispatched the key event directly on the page to rule out something on my end. The game never left the title screen.
And because Enter is the ONLY way in, there's no plan B. There's no clickable button, no "click to start". Accepting Space or a mouse click as well would rescue anyone who hits this. Also, the title screen itself says "READ THE DESCRIPTION FOR THE CONTROLS PLEASE!" and since you already have a screen sitting there, it's cheaper to draw the controls on it than to send the player out of the game to read.
Genuinely gutted about this one, because "touch the opposite colour" deserves to be played. Ping me if you patch the input and I'll come back and rate it properly. Staying open source is a great end of life answer, by the way.