Definitely one of my favourites. Very pleasant graphics, nice story, strongly fits the theme.
Some comments UX wise, it would be better to have researcher costs as separate column, tooltips were sometimes annoying to get away. Also, buy X for researches would be nice, since you want hundreds for the final item to notice any speedup.
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I'm glad you enjoyed it :)
I totally agree about the tooltips, I originally had them on the research buttons too and they are so annoying and get in the way. Noted on your other point - I originally thought it wouldn't be necessary but I either have to balance it so you need far fewer, or allow bulk buy/sell!