Cleansed - A fun short satisfying ASCII art game. A good base for someone to build on, if they feel so inclined, and add greater depth with more prestige layers and upgrades.
Shark Game: New Frontiers - Prestige sharks and other marine wildlife through various worlds with various positive and negative effects that change game play in various ways. The goal is to complete each faster and faster to get more essence to get more upgrades to complete worlds faster. etc etc etc. Good game with enough depth to entertain you for as long as a world, or two or three, takes to complete then put down till you feel the desire to complete more.
Connect the Pipes - Not exactly an incremental game but more a puzzle game where you choose how complicated a puzzle you want to solve. The goal of each puzzle is to get water flowing to all the bulb ends with no infinite loops of water. Grid sizes from 2x2 to 99x99 with a variety of tile shapes/patterns to keep the game fresh and challenging.