Based on the poor-quality of the photos (and my limited knowledge of Singapore insects) it would be very difficult to definitively ID this to species.
However, based on the shape and size, you're very likely looking at a species of ladybird beetle (aka ladybug; family Coccinellidae).
Specifically, I think this is a member of the subfamily Chilocorinae.
They are shiny color and usually have no spots or patterns on their wing covers. Their bodies are in round helmet shapes.
To show you an example species from this subfamily, here is a picture of Chilocorus nigrita:
Length 3.2-4.0 mm; width 2.9-3.9 mm.... Elytra black, shiny, with fine punctations. Ventral side including legs and inner margins of elytral epipleura orange yellow to yellowish brown, outer margins of epipleura pitchy brown to black [Source].
This site suggests that this specific species is common in India but also found in Malaysia, but the image above was actually taken in Singapore.
You can try to narrow to a specific species via Booth (2009) or the ID key found here.
Booth, R.G., 1998. A review of the species resembling Chilocorus nigrita (Coleoptera: Coccinellidae): potential agents for biological control. Bulletin of entomological research, 88(4), pp.361-367.