 If you liked
Kono Danshi, Uchuujin to Tatakaemasu.
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 ...then you might like
Tsuritama
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Both shows contain extremely colourful scenes and have a Slice-Of-Life catered feel. The topic of aliens is also present in both in which, 'Tsuritama' has a main character who is an alien and 'Kono Danshi, Uchuujin to Tatakaemasu' has a main character who defeats aliens. The characters are also a similarity; the main casts being completely male. There are also some moments that take place in the main characters thoughts. Lastly, both shows contain very light Shounen Ai.
If you're looking for a a slice of life anime that features a cute little (and slightly clueless) alien boy who makes his home on earth, forges relationships and has one cute little boy dear to him, then this anime is perfect for you!
Bonus: Both anime have a very light Shounen Ai-ish feel to them.