Survival small game plinker with a $150 cap?
I read this as requiring a lightweight, rugged, magnified optic with good light transmission and clarity. Able to take a few bumps, hold zero, and spot squirrels in in the morning or late in the day.
Fixed power gets you ruggedness and a better low-light image, but variability gives you options. A 2-7X from a reputable manufacturer might be the ticket.
Nobody really makes a high quality 2.5X or 4X scope anymore at that price—you have basic stuff from Simmons et al. and then it’s $250 on up. The guys at CameraLandNY can point you in the right direction as to options.