Cool battle mechanics -- I like that you even include the small detail of the graphic change when the weapon is changed and the stackability of the boosts is definitely fun for figuring out what will be the strongest. I also like the border of the battle background.
I would've loved to see at least a stationary image behind some of the white text narrative elements, rather than just a black screen -- though a full-blown cutscene would be even better. Based on your comments on the page already, that might have been a time-constraint thing and get added in later.
I'm glad to see that you're planning on continuing to expand on this because I think you have a solid foundation to continue building on.