Congrats on getting your first ever game published!
I am glad you chose my jam to submit it to - I find that making games for jams within their restriction is great for budding developers to practice honing their skills and working towards a manageable and achievable goal.
The advantage you will have is you will get proper feedback on your game so you know what worked well and what needs to be tweaked, expanded upon or improved.
I think this a great jam entry! It has a fun and relaxing vibe to it. The music works good with the variety of monster sprites and is perfect for a quick browser game.
If I were to give some critique I think the gameplay needs an extra dimension added to it to making it feel more engaging to the player.
Also I think the game can easily be beaten by moving to a corner where there are no events currently on the screen as I suspect RM2K stops processing random or move toward player movement events when they off screen.
That said I think this is really cool and you should be proud of what you got finished and complete in a short time :)