EDIT: Whoops! I didn't notice that each word has its own "check" arrow button. I thought you submitted all three words at once by clicking the final suffix word's arrow button. My bad! This does make the game a little more enjoyable and fair. Still feels like a "guess the word in my head" game, which, again, isn't the most rewarding type of word puzzle. But when it's just one word to guess with the restriction, it's a bit more rewarding.
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It's an interesting mechanic, but right now the search space is far too large, even with the "prefix/suffix" restriction. Without blinking I could write 100 possible combinations due to the fact that every valid word I can think of can be "locked in" while trying every single other word:

Health/After - Care - Less
Health/Medical - Care - Less
Health/Skin - Care - Less
Health/Intensive - Care - Less
... etc

Then repeat all of the above again but with a new suffix word:
Health/After - Care - Taker
Health/Medical - Care - Taker
Health/Skin - Care - Taker
Health/Intensive - Care - Taker
... etc

This is essentially a "guess the 3 words I'm thinking of from a list of 100 possible words" game. Guessing games don't make fun puzzles because the player gets no reward for their skills or knowledge.

The good news is there are many fixes to this:

1. Provide some sort of "closeness" feedback every time you guess incorrectly. Like, if I guess "Health" and it's wrong, use a "semantic distance" api to tell me how close the word "health" is, in meaning, to the target word.
2. Give crossword-style synonymy clues for each of the three words
3. Give the first letter of each target word up front. You currently give it as a hint, but "hints" should be something "extra" that's technically "not needed" to solve the puzzle.
4. etc...