This was my first jam as well! Loved your game. The ramping difficulty was nice, made for fun short sessions where I was encouraged to try and beat my previous score.
You've got lots of cool elements in here. Some better indication of the power would be nice -- I saw the orange color for the player, but there may be some clearer indications (sound effects) to show its readiness and duration.
The background was a bit dizzying at high speeds - think it's just because of the pattern/texture.
Great job, keep up the work, it's motivating to see folks nail projects like this on their first jams.