Hey Peter,
I really like this, I’m not played anything with a hot-air balloon like this before.
I found myself focusing on the detail you have added, specifically the balloon, I like how it expands when you trigger the flames, how it shrinks slowly again after, but also how it deforms when hit with a cannon ball.
Liking the fonts, the style, the dialog panels, the recording of “today’s” high score along with the last score, a very playable game
I may not have progressed far enough, with a high score of 55 at the time of writing, but I wondered whether you had considered any other mechanics which may affect the balloons flight? Wind seems like an obvious one to consider, either as something which speeds up the balloons horizontal movement, or slows it down, coincidentally timed with some hazards perhaps.
The monochrome feel kinda works too, although I would be intrigued to see what a colour version may look like.
Just had another go and scored 115, I ran out of fuel, missed the fuel canister at the very beginning and got knocked backwards by a cannon which prevented me from reaching the second fuel canister in time.
Other observations - the cannons are quite big… and some additional hazards could be fun too, a flock of birds, clouds, some arches firing arrows up at you. A little background audio perhaps, and a settings window to configure the volume and controls (customisable). Just some thoughts
Really like this, well done on completing your own version of a project boost inspired game and publishing it!