Fun, but not very hard.
This has the potential to be a great puzzle game, but it's badly executed. You're given no time to examine the board, so rather than making intelligent decisions, you're just picking a random square and hoping it's the right one.
Also, there are way too many enemies coming at you. This isn't a tower defense game - showing you can hold off six or seven should be enough to demonstrate you've solved the puzzle. You don't need to send a wave of 40 of them. Instead of puzzle solving, you're clicking like mad to get the flags down, and even then it's easy for one to slip through.
Also, having to wait for the list of the names of each explorer to print out at the end of each level needlessly slows the game down.
The artwork is really nice.
Fun Mario Bros like game. Controls could be better, though.
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