I know that Bluster leverages igraph to do clustering. Seurat has ordinary Louvain and "Louvain with multilevel refinement" (but no reference). Is there any way to get the second kind via Bluster? It does look nicer, as my supervisor noticed when my scater-based plots looked messier than a colleague who uses Seurat's plots, ignoring that it is all a specious art for just a wee moment.
If the plots 'look nicer' then this is probably due to UMAP parameters, and not the colour clustering as the clustering only comors indovidual points. Default UMAP parameters are a bit ugly indeed, try setting the spread and min_dist of UMAP to something like 0.75 to have points more spread out and not bunched up that much.