I didn't see where the adherence to the topic was. But it still has nice graphics and I haven't found any major bugs, so congratulations.
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Thanks dude, this is my first ever game i ever did programing wise, so glad that it turns out ok and you liked it :)
The adherence to the theme is a bit weak here i can agree, but the idea i had was that the "Only One" aspect could be : one screen and one mechanic. So what i did was a one screen game where your only means of attack is on the jump and the attack lasts one second.