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This game, honestly, has incredible depth for a seasonal niche game... Take some of the suggestions in the comments, expand and flesh out the game, change the theme to something non-seasonal and you have a classic game on your hands...
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needs a speed up key, a sell option, the towers and enemies need to be different (for example the reindeer does splash damage and the elf does slow while the snowman is the basic tower type; and for enemies adjusting the exp earned for killing different types, right now it looks like the tree stump is the only one that different and thats only at a value of 2 exp, so giving them varying 'loot' of exp and gold) and the towers also need to have an upgrade ability in lvl (it would be nice if they had different paths in the way of the protector series, so you could upgrade a reindeer to focus on power, splash, or speed, or the trees could be decorated with different things, ornaments to 'distract' (slow), tinsel to up the power of towers around them, or flashing lights to do small amounts of damage.) its a good start, but needs work
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wow those last few stages are tedious, the monsters live about 8 seconds and the stages take forever. Might want to scale their hp by level or something.
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I suggest Santa to buy a real house instead of staying in the woods, for example one close to the north pole :)
Else nice season game which would benefit from upgrades between levels.
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Overall, a good game. It would be better if it had a pause before starting the level to place towers, higher difficulty as the level progresses (becomes too easy), and more enemy types. + if you agree