I like how the chord progression goes in a few places I didn't expect. I also love the song title, but for a song called Ticklish Heart, I think some of the synth choices are a little abrasive. Doesn't mean I don't like it, though! Combined with the weird chord switchups, It gives a cutesie chiptune vibe with a dark undertone.
If I may take a guess, I can assume it's because having a "ticklish heart", or, a sensitive and delicate one, so to speak, has it's good and bad aspects. On one hand, you are much more open to the love and affections of those who are kind and wish to spread such things, however, those looking to cause harm will have a much easier time manipulating and/or breaking you down for having a "ticklish heart". I know that dilemma all too well.
Or maybe I'm looking too deep into it and you just wanted to create a nice piece of music. Idk lmao. Either way, not a bad track you got here!
Have you ever considered releasing your music on Bandcamp? That way people could download it in lossless if they wanted. I love Newgrounds, but why it doesn't offer lossless uploads and downloads for audio when it offers insane image resolution will forever be a mystery to me. Hope they implement that sometime soon.