First, the pacing and difficulty curve is excellent. Second, the soundtrack is fucking awesome. 5/4 time signature with that repeating minor sixth interval. It's haunting and sullen and grave. Perfection.
LETS GOOO I JUST SCORED 101!!! Visuals-wise, I'll start with the positive. The minions' design (tentacle-based) is the strongest. Very good, well-animated, and sets up this sort of fantastical and eerie but playful tone. Next up, the blaster works fine. I think even the campfire is acceptable, because it's a mere set piece.
The main character needs work. Players MUST sense the main character had care put into it, because we as players are it. I get the sense you might partly be hiding behind a lack of effort (last week with the audio; this week, the visuals). Now, you might defend yourself against my accusation by saying you only had three hours.
But we both know there are completely respectable and self-serious ways to produce assets under time pressure: you achieved it here with the audio. And you achieved it last week with the visuals, too!
Your SPECIFIC talent -- I'm calling YOU out specifically, here, because it doesn't apply to other, less experienced devs -- YOUR talent is ready to stand on its own merit, without having to hide behind the crutch of joke assets. Risk trying and failing, put your heart into it!
I also get the sense that you are intelligent. All you have to do is get a Pinterest, search "simple character design" on Pinterest, and start collecting images you like (that seem vaguely achievable). Then roughly base your next character's design off the general proportions you see in the stuff you like. The result might frustrate you. It may not look at all like the original. This always happens, and it's normal, and it's okay. The player won't see the original; all they'll see is your finished design, which I guarantee will look way better than starting from scratch. You can even get creative and combine two different aspects of two references. Stand on the shoulders of giants, I think this is all you need.
Lastly, choose a palette. You should be choosing palettes, like, YESTERDAY!!!
Please excuse the unusual sternness in my tone, it's just every. Single. Aspect of this project is RIGHT THERE. As soon as the visuals catch up, you're pumping out solid gold. I would even be willing to devote a set of three hours just to produce assets for your next project, in whatever style you prefer, because of how much I believe in your vision and potential. Better yet, you design the initial character and then I will animate it for you.
Please take this to heart and keep going!