The next update for Tomb Defense is mainly be focused on improving the UI but there's also going to be a few extra additions. Here are some of the things to expect.

Menus have been given an upgrade with interactable elements being more centred.
Buttons have been given backgrounds to be more clearly defined.
In-Game UI now fade in when the game starts
Score counter tallys up instead of updating instantly
Combo number grows when multiplier increases
Combo circle smoothly increases
Wave number glows red when the wave increases
Screen flashes red when hit

VR guns have a sense of weight (can be disabled in options)
VR gun aim offset can be set in options

These are the things that have either been implemented or are planned, there will be more when the update releases.