i've tried something similar and found out that the "TopMost" property from the application will not show the form while you are ingame. i found two possibilities.
1. create a directX/openGL (depends on your game) window to overlay your game or
2. do the easy way (which i did choose) and just write on the current game window. for this you have to look how to find the game window and using the drawing.2D namespace.
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