I enjoyed the creative spark of having to use only provided assets and using things in ways they probably weren't intended to be used :). I didn't settle on the idea of doing Haunted House until I saw the bat sprite in motion, then I started building the house out of different sets of terrain blocks, wanting the floors to be different from one another since the Atari version uses different colors. After that, it was picking out things to use as the player, treasure, stairwells, the front door. Haunted House didn't have an in-game antagonist, but it came with a booklet that had a story, so I went with the large animated skull and had his animated mouth tell the story instead of bite or attack. Probably if I was creating my own art, it would have looked a lot different, but would the game even exist if that bat didn't kickstart my thought process?
The one thing I found myself wishing I had more of was sfx/music options (I didn't solve the puzzle to unlock the additional assets, so I may have missed some). I think it was just the mood of my game didn't fit with most of the provided sounds. I ended up using the game over sound on my start screen because it was the "spookiest" one :).