I don't think I ever wrote about this, but there's a Flash game called "Tower of Heaven" that I recommend. It's done in the style of an original Game Boy game, it's got a great soundtrack (in the period style, of course,) and it has some moments of laugh-out-loud cruelty. It's not actually impossible, or even that difficult by the standards of the genre, but there are a few moments of blind rage to be had. It's also short, which is nice -- 11 levels, of which some are dead simple.
And, of course, it has a tower.
May heaven grant you fortune.