Hey great job! I love the aesthetics and sound design, and your dialog bubbles are very funny! I would recommend to, in your next game jam, pay attention to giving the player a stronger sense of progression, which feels like it is missing in this game. It is there -- the music speeds up, the mummies spawn faster, and the score is increasing -- but it isn't strong. The more you can make the player feel like they are getting somewhere -- and really bash them over the head with the idea that they are progressing -- the more fun it will be!
I'll also add something else, something I read in an article a while ago. I'm not sure this is the same article, but it is very similar: https://www.psychreg.org/why-people-play-video-games/
The idea is that there are three main reasons people enjoy video games: feelings of competency, autonomy, and relatedness. A lot of games focus on competency, and that's the one related to your game: you have to make the player feel like they are really good at the game. You want stakes to feel very high, but you also want the player to succeed. For this game, I didn't have a hard time avoiding the mummies, so as far as making sure the player can succeed, you're good; but how can you then make the stakes feel higher? That's up to you! One thing is adding that sense of progression; if I feel like I've gotten somewhere, then dying will feel like losing all my progress! The stakes will increase as I play the game! There are plenty of other ways to raise the stakes, I'm sure, but that's just an example.
I'm no professional game designer (as you might find in my own entry); however, I hope these ideas have been helpful!