This is a really outstanding jam entry!  There's a lot of charm and polish in it.  There's the obvious stuff a lot of jam submissions don't have like a plot and voice acting, but I really loved the addition of scanlines and chromatic aberration to make this really feel like an older game!  All three bosses being totally unique is great, especially the second one with a totally different playstyle.  The credits having a little video for each role is also such a nice touch.  I had a really fun time when I learned you could combine jumping and diving to gain speed!

My one piece of criticism I think would be I think the drilling controls feel awkward.  In the tutorial you teach drilling by having to cross through a wall on to the other side, but drilling really seems to be used to mostly gain height.  I had a really awkward time getting through that tutorial wall, but the mechanic made more sense in the first boss when I had to use it to gain height.  I think I'd suggest adjusting that tutorial so that you have to gain height with the drill rather than just pass through the wall.  

Excellent job!