The graphics are minimal but that doesn't really bother me that much. There's no music either though. The gameplay is okay but there are some annoying issues:
1. The passages are tight so it can be hard to go through them
2. The spaces where you're supposed to hide seem to bounce you away and the only way to stay in them far enough for the enemies to not touch you is to keep holding the direction key while in them. I couldn't stay in some of them even while doing this.
I appreciate that you don't need to get all the buttons in one life, as I definitely would not have been able to beat some levels without it (especially because of problem no. 2).
Overall, for your first game, it's pretty good. Keep practicing and I'm sure you can make something better.