You do have some jaggies there.
A touch of anti-aliasing wouldn't go astray if this is running on larger displays.
Mixed resolutions? I'm not a fan but whatever cranks your cheese wheel.
Here's a shitty/lazy pressed in button:

It would also generally look better if the text was "inside" the button by sitting underneath the reflection effects, rather than merely appearing as something sitting on top and made of a different material.
I haven't bother to do this here.
Just another idea is to make it glow when pressed instead:

I cheated here using Photoshop just to give you the idea.
You can certainly do this in pixel art but for buttons this size I would be inclined to Photoshop, setup layers for background, text, and top with various effects etc.
That way you can even make Smart Objects to pump out large volumes of buttons with editable text that automatically rasterizes the fonts with some effects performed.
All this can be googled/youtubed once you know what your looking for.
Bit off-topic for this forum but there you have it.