Wow, a really solid entry, love the concept. A tutorial would've been nice, but I figured it out soon enough. I noticed you have pixel transparency, however (e.g. in the "3, 2, 1" you can still see a 'ghost' of the '1' after it disappeared), and I don' think that's allowed. Apart from that, really solid, fun game that I have nothing to complain about.
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Thank you for the comment!
Actually that kind of "transparency" is allowed. On old displays pixels usually didn't turn off immediately. They had some kind of "ghosting" (like old lightbulbs) including Nokia 3310. The transparency which I added is therefore allowed. It was even mentioned in the following FAQ post: https://itch.io/jam/nokiajam5/topic/2574730/faq