1. What I would like to see improved is perhaps having a choice of music as the Indiana Jones thing could get annoying. Perhaps something of Hip Hop, Easy Listening but still upbeat or maybe even a Rock theme. Also the scrolling screen was not fun, I agree with some of the previous reviewers about it needing to go.
2. Different themes for each day would be a nice addition and perhaps some "power-ups" as it was previously suggested. Maybe some along the lines of making time slow down/speed up, making the Rainbow Spider smaller/larger, making the webbing thicker/thinner and maybe a power-up that would let the Spider make something enabling it to hover/fly for a short time period.
BUT, other than the small flaws it has, it was a fun game.