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If your input has a min=0.2 and you're not seeing it in the output.
Do you have coincident (duplicate) points, if so, eliminate them.
How close is the nearest point to the one with 0.2?
What happens if you make your cell size smaller?
I tried to make it with really fine cells, then it creates some weird results ranging from -1 to 17. There is no overlapping points and the points are scattered with distance of about 500-700m between them.
IDW can never give you -1 if the min=0.2
If you don't get exactly 0.2 or the max value in the output raster then it means that these input locations do not fall on the cell center of the output raster.