Yeah! First game I played this jam, and I off to a good start! Finished the game with 5:54 on the clock! I really liked the difficulty curve- you start off with easy levels, and end up with some that really test your planning and execution. I could see this as a "big" game (maybe with a change, where you have slightly bigger error margin, but get stars, or points for perfect execution). As it is, for a jam game- this is great.
The art style, and the parasite theme reminded me of the game "endoparasitic" :)
The presentation was great- the music was good, and fit the game well. The graphic style is minimalism done right.
Coming back to gameplay- I liked how you made so many interesting puzzles with a simple mechanic (like when I needed to aim at a really steep angle, so the parasite didn't have to walk too far in level 3).
As for the theme. That's a really original take. You don't really often think of parasites as guests, but they sure as hell are uninvited :D
Seriously, great game! Keep it up!