I'm a huge fan of when people voice act their game jam games, so points to you on that one. Until level 4, it felt like there wasn't much of a challenge at all, so what I might do to combat that is get rid of the initial collision with the wasp circle, and maybe increase their speed a bit. That would require a bit more work when it comes to telegraphing how the wasps are going to move, because you have to ensure there are gaps where the player can cross. Regardless though, this was quite a fun game and I enjoyed playing it!
Thanks for the feedback! I'm glad you enjoyed the voice acting. We struggled in the design process about fine tuning difficulty and it's interesting you're asking for more difficulty as some have found it quite hard, we're still trying to figure out the best way to tailor it to as many people as we can (personally, I love challenging games, but they're definitely not right for everyone so it's finding the balance).