this is a really fun game that seems that have a lot of work and time towards it within its timeframe.
especially when you try to get as high as you can while a ton of stuff is around you and the choice of upgrades gives a sense of variety, though I think that I wouldn't go as high if I didn't choose 'rifle'
one issue that I notice is that when I get into space, I can't collect any more balloons, I see the balloons touching my balloon but they are not collecting.
other than that, great game!