In all normal 3d games such light probes are placed specifically in some places so it would look good, only Raytracing is giving let's say better results if properly used.
Generally now it looks even better, but adding such lightning makes some mismatch between different elements, because there are no shadows that would darken some other elements, normally easier way to deal with such pre-backed light is to use ambient occlusion, but it's for more modern '3d engines', another way would be as already someone mentioned, to make graphic more cartoon-y with cel shading or brighter colors, it would change the art/graphic style of game but could be more appealing. Of course you may find some way to tune this even more, maybe lit up that grass that is closer to light source or something like this.
Good idea about leaves on trees
Generally now it looks even better, but adding such lightning makes some mismatch between different elements, because there are no shadows that would darken some other elements, normally easier way to deal with such pre-backed light is to use ambient occlusion, but it's for more modern '3d engines', another way would be as already someone mentioned, to make graphic more cartoon-y with cel shading or brighter colors, it would change the art/graphic style of game but could be more appealing. Of course you may find some way to tune this even more, maybe lit up that grass that is closer to light source or something like this.
Good idea about leaves on trees